Obsidian vs OneNote: Privacy Comparison
In this comprehensive privacy comparison, we analyze Obsidian and OneNote across six critical dimensions: data collection practices, encryption implementation, third-party data sharing, user privacy controls, transparency, and historical track record. Both services serve similar needs, but their approaches to user privacy differ significantly. Our analysis reveals that Obsidian offers a meaningfully better privacy experience overall, though each service has relative strengths and weaknesses worth understanding in detail.
Bottom Line First
Before the dimension-by-dimension breakdown, here is the summary our scoring produced. Across the six privacy dimensions we score, Obsidian finishes ahead of OneNote, 40/60 to 34/60. That total reflects a privacy comparison in which one service is consistently the more privacy-respecting choice, even though both cover the same functional ground.
Data Collection produced the widest separation between the two, with Obsidian ahead 5 to 4 out of 10. Data Collection is where they come closest, a mere 1-point gap (5 vs 4 out of 10). The full breakdown that follows shows where each point was won or lost.
What Gets Collected
Every privacy assessment starts with data collection. How much a service gathers, stores, and processes about its users is what ultimately drives the privacy risk of using it. Obsidian takes a leaner approach here, capturing only the data strictly required to make the service work. Its rival pulls in a wider net of information -- behavioral patterns, device identifiers, and usage analytics that go well past what the core features actually need. Our marks were Obsidian 5/10 and OneNote 4/10 in this area. What separates them is not merely how much is gathered but why it is gathered and whether it is truly needed.
How Strong Is the Encryption
Encryption protects user data both in transit and at rest, and the implementation quality varies dramatically between services. Obsidian implements stronger encryption measures, including more robust protocols for data in transit and better protection for stored data. The specific encryption implementations differ in their coverage (which data is encrypted), their strength (which algorithms and key lengths are used), and whether end-to-end encryption is employed (preventing even the service provider from accessing user content). Obsidian scored 6/10 while OneNote scored 5/10 for encryption.
Third-Party Data Sharing
One of the most important privacy questions is how freely a service passes data along to others. The list of recipients can run from advertising networks and analytics providers to business partners and government requests. Obsidian draws firmer limits around third-party access to user data. Such practices matter for security and not only privacy, because each new entity with access is another door through which a breach could occur. Scores: Obsidian 7/10, OneNote 6/10.
Controls You Can Actually Use
Individuals only hold real power over their data when a service's privacy controls are available and genuinely effective. The relevant tools include the option to opt out of data collection, ways to download and erase data, granular permission settings, and how readily users can exercise the rights afforded them by applicable privacy regulations. Obsidian offers more complete and approachable privacy controls. Scores: Obsidian 8/10, OneNote 7/10.
Transparency
Transparency encompasses how clearly each service communicates its data practices. This includes the readability of privacy policies, the publication of transparency reports, responsiveness to privacy inquiries, and proactive communication about policy changes. Obsidian demonstrates stronger transparency overall. Clear, accessible privacy communication is essential for informed consent and trust. Scores: Obsidian 9/10, OneNote 8/10.
Track Record Over Time
Looking at how a service has handled privacy incidents, regulatory actions, and disclosed vulnerabilities over time adds essential context. Obsidian carries the better historical record on privacy, having faced fewer incidents and dealt with the ones that did come up more responsibly. How a company has acted before is usually the clearest signal of how it will act on privacy going forward. Scores: Obsidian 5/10, OneNote 4/10.
Our Bottom-Line Call
Our comprehensive analysis gives Obsidian a total score of 40/60 and OneNote a total score of 34/60. The overall winner for privacy is Obsidian. While both services serve similar functional needs, the winner demonstrates a more privacy-respecting approach across the dimensions that matter most. That said, no service is perfect, and users should always configure privacy settings actively regardless of which option they choose. We recommend supplementing your choice with additional privacy tools, a VPN, DNS-level ad blocker, and privacy-focused browser, to build a comprehensive privacy posture. If your threat model requires the strongest possible privacy, consider whether an even more privacy-focused alternative exists in this category beyond the two compared here.